GB/T 25715-2023Pipe moulds for centrifugally cast ductile iron pipe (English PDF)

1 Scope

This document specifies the specifications, structural types, dimensions of water-cooled metal pipe molds and hot-mold paint-type metal pipe molds for centrifugally cast ductile iron pipes:

dimensional tolerance, chemical composition, mechanical properties, low-magnification structure, metallographic structure, non-destructive testing and dimensional accuracy, and describes the corresponding test methods, inspection inspection rules, labeling, packaging, transportation and storage:

This document is applicable to the design, manufacture and acceptance of pipe molds for centrifugally cast ductile iron pipes made of alloy steel:

2 Normative reference documents

The contents of the following documents constitute essential provisions of this document through normative references in the text: Among them, the dated quotations

For undated referenced documents, only the version corresponding to that date applies to this document; for undated referenced documents, the latest version (including all amendments) applies to this document:

GB/T 222 Allowable deviations in chemical composition of finished steel products

GB/T 223:82 Determination of hydrogen content in steel and iron by inert gas melting-thermal conductivity or infrared method

GB/T 226 Acid etching inspection method for low magnification structure and defects of steel

GB/T 228:1 Tensile testing of metallic materials Part 1: Room temperature test methods

GB/T 229 Charpy pendulum impact test method for metal materials

GB/T 231:1 Brinell hardness test of metallic materials Part 1: Test method

GB/T 1184-1996 Shape and position tolerances No tolerance values noted

GB/T 1804-2000 General tolerances Tolerances for linear and angular dimensions without tolerances noted

GB/T 1979-2001 Low-magnification structural defect rating chart of structural steel

GB/T 4336 Determination of multi-element content in carbon steel and medium-low alloy steel Spark discharge atomic emission spectrometry (conventional method)

GB/T 6394-2017 Method for determination of average grain size of metals

GB/T 10561-2005 Standard rating chart microscopic examination method for determination of non-metallic inclusion content in steel

GB/T 11261 Determination of oxygen content in iron and steel by pulse heating inert gas melting-infrared absorption method

GB/T 13295 Ductile iron pipes, fittings and accessories for water and gas

GB/T 13320 Metallographic structure rating diagram and assessment method of steel die forgings

GB/T 13384-2008 General technical conditions for mechanical and electrical product packaging

GB/T 20066 Methods for sampling and preparation of samples for determination of chemical composition of steel and iron

GB/T 20124 Determination of nitrogen content in iron and steel - Inert gas melting thermal conductivity method (conventional method)

GB/T 37400:15-2019 General technical conditions for heavy machinery Part 15: Non-destructive testing of forged steel parts

3 Terms and definitions

The terms and definitions defined in GB/T 13295 and the following apply to this document:

3:1 pipe mold pipemould

Molds used to produce centrifugal ductile iron pipes: […]